Irregular period.. Help plz!

So I've had my period 4x in 5 weeks and I am so worried! This can't be normal and I'm thinking the worst. I have a doctors appt later this week but I've been losing sleep over this. I have an aunt who has PCOS and it's seriously worrying me that I may have it. My menstrual cycle has always been normal so this is really scarying me. Have any of you ever experienced this problem?